The organic rules for the milk producers are:

• The cows must be fed 100% organic feed, and at least 60% of the daily feed ration must be grass or other fodder. Feed must not be used that contains or is produced from genetically modified organisms (GMO).
• The cows must have access to grass field for at least 6 light hours daily from April 15 to 1st November when the weather conditions, soil condition and the physical condition of the animals allow it
• The cow and its calf must stay together at least one day after birth. The calf must be fed with breast milk for at least 3 months after birth.
• Calves under 3 months must not be sold out of the country.
• It is forbidden to kill calves systematically (however, it is allowed on farms with ongoing Salmonella Dublin).
• There must be access to skincare (cow bristle) in all stable sections and on the grass field
• If a cow is treated with medicine the milk and meat must not be sold for twice as long as for the conventional cow’s treatment. It must be a veterinarian who prescribes medication and treats the cow.
• There is a ban on the use of human-critical antibiotics for cattle.

The milk producer is not allowed to use use fertilisers and pesticides on his fields. He should instead use natural fertiliser (slurry) as well as frequent crop rotations and weed removal machines.

(sumber : https://danishdairyboard.dk/products/organic/)